diff --git a/doc/intro.md b/doc/intro.md
index 8c87f9b65..81413032e 100644
--- a/doc/intro.md
+++ b/doc/intro.md
@@ -23,6 +23,8 @@ The main goal and characteristics of the Grin project are:
 * Design simplicity that makes it easy to audit and maintain over time.
 * Community driven, encouraging mining decentralization.
 
+A detailed post on the step-by-step of how Grin transactions work (with graphics) can be found [in this Medium post](https://medium.com/@brandonarvanaghi/grin-transactions-explained-step-by-step-fdceb905a853). 
+
 ## Tongue Tying for Everyone
 
 This document is targeted at readers with a good